[Nouveau] [Bug 82835] [NV92] GeForce 8800 GS VDPAU h264 decoding hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82835

--- Comment #8 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to comment #7)
> (In reply to comment #6)
> > Hm, just noticed this (same as last time, but I guess I wasn't paying enough
> > attention):
> > 
> > nouveau E[  PGRAPH][0000:05:00.0] ch 4 [0x00178fb000 mplayer[1645]] subc 3
> > class 0x8297 mthd 0x1b0c data 0x1000f010
> > nouveau E[     PFB][0000:05:00.0] trapped write at 0x00204050c0 on channel
> > 0x000178fb [mplayer[1645]] PGRAPH/PROP/RT0 reason: PAGE_NOT_PRESENT
> > 
> > method 1b0c == QUERY_GET. However the data is 0x1000f010, not 0xf010, which
> > means it's not coming from the video stuff or the screen fence stuff, but
> > rather is a PIPE_QUERY_GPU_FINISHED query. Which is interesting, because
> > nothing appears to actually use that PIPE_QUERY type...
> > 
> > Could you stick a assert(0) right before
> > 
> >       nv50_query_get(push, q, 0, 0x1000f010);
> > 
> > in nv50_query.c and see if it triggers (make sure to use a debug build... or
> > make it something nastier than assert), and get a backtrace from gdb? (Or
> > actually just set a breakpoint on that line and see if gdb hits it...)
> 
> No, I tried  to add assert :
> 
> diff --git a/src/gallium/drivers/nouveau/nv50/nv50_query.c
> b/src/gallium/drivers/nouveau/nv50/nv50_query.c
> index a373dc6..23f5eaf 100644
> --- a/src/gallium/drivers/nouveau/nv50/nv50_query.c
> +++ b/src/gallium/drivers/nouveau/nv50/nv50_query.c
> @@ -222,6 +222,7 @@ nv50_query_end(struct pipe_context *pipe, struct
> pipe_query *pq)
>        break;
>     case PIPE_QUERY_GPU_FINISHED:
>        q->sequence++;
> +      assert(0);
>        nv50_query_get(push, q, 0, 0x1000f010);
>        break;
>     case NVA0_QUERY_STREAM_OUTPUT_BUFFER_OFFSET:
> 
> on top of mesa-git-454aab4 and it doesn't trigger  during mplayer's run
> (resulted in usual hang).

Can you confirm that you built this with --enable-debug? And you saw the
0x1000f010 value in your dmesg?

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